Malicious PDF — malware analysis report

Static analysis result for SHA-256 280145111770e104…

MALICIOUS

PDF

93.8 KB Created: 2021-08-20 04:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 631e49fa26571b934bef2637322b99b2 SHA-1: f82a273d5c7ca31ea2d92d06632ecd5ac49bdfa2 SHA-256: 280145111770e1044991d9511c58682fe0f9c52f0e787ac251ed078a53738fd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs pointing to compromised websites and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely used for phishing or SEO poisoning. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=the+startup+owner%27s+manual+steve+blank+pdf+free+download PDF link annotation
    • https://samoinstitute.mn/uploads/assets/file/39215732016.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8d854279---fenodibon.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608743bb880b7---22039855563.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vidikubukojelubig.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/95199346524.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/57972485521.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/02a3d6f749702845b2c87ae8d953a5a9/2613746478.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/77377905906.pdfIn PDF document text
    • http://getem.eu/files/file/64432761958.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/kulito.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/35783743541.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/jetujejozajidanav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afaeead10e8---1437743947.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/34385556690.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a1df0032---17398656766.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897bd02e010---riziz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/32240p13tjl1scqkpvtd6kaa8p/nurajasavadepadulisa.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/59420014117.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/olo7cpmmfn08d0pcitm0j77kd6/fifoxusofipumojofaku.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/zolenuwejox.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085b92ad8105---60877477363.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4dd6c5557---kitogesekewowidija.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/ziwoj.pdfIn PDF document text
    • https://csn-alliance.com/data/files/54899464292.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/90625425030.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/95918219717.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 11152 bytes
SHA-256: a403643e4226dbf4d787f40e53c72c0bc32f4c109123b1dfeaebd2863053f930
font_01_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 17208 bytes
SHA-256: 59593fa8db18421a504695a36e421bcfa0666b4304987555deeb4207d6af4d84
font_02_sfnt_off00014efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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